Cisco Cisco IOS Software Release 12.4(15)T

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The Cisco NM-1A-T3/E3 (or ATM T3/E3) network module provides Asynchronous Transfer Mode 
(ATM) services on a T3 or E3 connection. This feature module explains how to configure the ATM 
T3/E3 network module for each connection. The ATM T3/E3 network module is supported on 
Cisco 2800 and Cisco 3800 routers and includes the following features:

ATM traffic management features including constant bit rate (CBR), variable bit rate (VBR), 
available bit rate (ABR), unspecified bit rate (UBR), and UBR+

Classic IP over ATM encapsulation (RFC 1577)

Multiprotocol encapsulation over ATM adaptive layer 5 (AAL5) segmentation (RFC 1483)

Point-to-Point Protocol (PPP) over ATM

LAN Emulation (LANE)

Your Cisco IOS software release may not support all the features documented in this module. To reach 
links to specific feature documentation in this module and to see a list of the releases in which each feature is 
supported, see the 

Use Cisco Feature Navigator to find information about platform support and Cisco IOS and Catalyst OS 
software image support. To access Cisco Feature Navigator, go to 

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